Crossword Genius

Bikini perhaps left line after caution regularly ignored (5)

Ross

I believe the answer is:

atoll

'bikini perhaps' is the definition.
(Bikini Atoll)

'left line after caution regularly ignored' is the wordplay.
'left' becomes 'l' (common abbreviation**).
'line' becomes 'l'.
'after' says to put letters next to each other.
'regularly ignored' means one should take alternating letters.
The alternating letters of 'caution' are 'ato'.
'l'+'l'='ll'
'll' after 'ato' is 'ATOLL'.

(Other definitions for atoll that I've seen before include "Pacific coral island" , "Coral island(s) surrounding a lagoon" , "String of islands" , "Circular coral reef" , "Coral circle" .)

I've seen this clue in The Telegraph.
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